With more and more distributions upgrading to the new XulRunner version 1.9 more and more users send bug reports of Liferea becoming unusable because of constant 100% CPU usage.
Right now I'm sorry to say that I have no clue what causes this, debugging is still going one. Hopefully we will find the problem.
Affected versions: There seems to be no limit to the affected versions. I got reports from 1.4.12 up to 1.4.16b all affected. The common symptom was all setups are using a recent XulRunner 1.9. Until now there were no reports about setups with XulRunner 1.8 having the problem.
If someone reading this with insight in XulRunner/Gecko/Mozilla has any idea please post a comment or send a mail!